Power jack



F.4D. HOFFMAN.

PowER- JACK.

A APPLICATION FILED NOVI 2.5, 1921. I 1,41 4, 876 Patented May 2,` 1922.

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POWER JACK.

APP L|cAT1oN min Nov. 2s. |921.

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2 SHEETS-SHEET 2.

Parar FRED. D. HOFFMAN, Ol FORT WORTH, TEXAS, ASSIGNOR T0 P. E. MILLER, OF FORT WORTH, TEXAS.

POWER JACK.

Specication of Letters latent.

Patented May 2, 1922.

Application led November 26,1921. Serial No. 517,893.

To all (whom 'it may concern.'

Be it known that I, FRED. D. HOFFMAN, a citizen of the United States, residing at Fort Worth, in the county of Tarrant and State of Texas, have invented certain new and useful Improvements in Power Jacks, of which the following is a specication.

My invention relates to improvements in power jacks; and one object is to provide a walking beam structure having combined therewith oscillating weighted pendulums,

the momentum of which is utilized `to operate more efficiently reciprocating mechanism such as pumps, well drilling machines, and the like, somewhat in the same mannery as the efficiency of any drive mechanism is increased by the use of a iiy-wheel.

A further object is to utilize weighted pendulums by connecting their movements directly with the reciprocating.mechanism whereby a considerable saving in the operating power is attained.

This invention further relates particularly to power jacks, such as that disclosed in the Patent No. 1,359,644, Nov. 23, 1920, by making the mechanism shown and described therein selective and adjustable, whereby the same apparatus may effectively perform functions of diderent conditions, instead of building a new apparatus for each condition.

Other objects and advantages will be fully explained in the following description and the invention will be more particularly pointed out in the claims.

Reference is had to the accompanying drawings which form a part of this application. Fig. 1 is a side elevation of a power jack equipped with the improvements, Fig. 2 is aplan view of the same. Fig. 3 is a side elevation of the power jack shown with the walking beam in eXtreme position of oscilation. Fig. 4 is a detail view, illustrating the manner of corrugating the bearing faces of the pendulums and levers.

Similar characters of reference are used to indicate the same partsthroughout the several views.

The power jack is provided with a frame consisting of a pair of upright angular members 1 provided with bearings, 2 for fulcrum shaft 11. One or more walking beams 3 are fulcrumed on the shaft 11. An operating rod or pitman bar 4 is pivotally connected to one end 0f a walking beam 3 and may be driven by any suitable mechanism so as to move the walking beam 3 at a predetermined number of strokes per minute.

' Pivotally connected to the ends of the walking beam, are the pendulums 5, each provided with a weight 6. The pendulums 5 are operatively connected with power transmitting levers 14 and 15 by means of hollow bolts 16 and corrugated bearing faces 17 which connect the pendulums and levers laterally. By means of the corrugations in the bearing faces17, the levers 14 and 15 may be fixed at different angles with each other and also fixed at any selectedangles with the pendulums 5. The hollow bolts 16 revolve or oscillate on pins 18' which are journaled in the walking beams.

A Y-lever 8 -is made rigid with the shaft 11, which isjournaled in the bearings 2 of frame 1 for operating a walking beam 9 which is connected to the upper ends of reciprocating pump rods 10. The object of the Y-lever is to make two di'erent connections vwith the levers 14, one arm of the Y being'longer thanithe other. The Y-lever has two (pivot pins 7 and either pin may be connecte to the links 19, thus lengthening or shortening the distances to levers 14 according to the angular positions of the latter.

The levers 14 and 8 are connected by adjustable connecting rods 13 through links 19 and 20 and the distance is lengthened or vshortened by turning the adjusting wheelsl 21, the ends of the rods 13 beino threaded to be screwed into the links 19. zprings 22 are mounted on the rods 13 between the links 2O and the wheels 21 and turning the wheels 21 will simultaneously tighten or loosen the springs 22. Nuts 24 are mounted on the ends of the rods 13 and springs 23 are mountedon the rods 13 between the links 2O and the nuts 24 and the springs 23 may be tightened or loosened in the same manner as the springs 22.

The levers 15 are connected by an adjustable connecting rod 25, which is lengthened or shortened by means of a wheel 26 operating ther reversely threaded rod ends 27. Links y15 are pivotally connected to the levers 15. The rod 25 is connected to one link 15 and the rod 27 is connected to the other link 15. The rod 25 is made adjustable to vary the stroke or throw of the pendulums 5.

Adjustable spring bumpers 2S are attached to the walking beam 3 and located at the eXtreme oscillations of the levers 14; for cooperating with the springs 22 and 23.

An auxiliary walking beam 29 may be fastened to the walking beam 3 by bolts 30 and suitable spacing sleeves thereon or attached in any other suitable manner. Vertically adjustable rods 31 project up through the beam 29 and are provided with springs 32 mounted on the rods above the beam 2Q and held in place thereon by suitable nuts and washers. The rods 31 are connected by elbows 31 to levers 33 which are connected laterally to pendulums 35 and the pendulums are laterally connected to levers 34. The levers 33 and 34; and pendulums 35 are connected by hollow bolts 36 which are mounted on the pivot pins 35. The levers 33 and 34: and pendulums 35 are laterally connected by corrugated surfaces so that they may be set at the required angles to each other. each other by the connecting rod 37 which has oppositely threaded ends and is provided with a wheel 36 for accomplishing the adjustments.

When the walking beam 3 is oscillated by the application of power thereto through the reciprocating rod 1, the pump rods 10 will remain immovable, until the pendulums 5 begin to swing and their relative move ments are transmitted through the adjustable rods 13 and 25 and the lever 8 to the short walking beam 9 which operates the pump rods 10.

Every reversal of the walking beam 3 (see Fig. impels the two pendulums 5 to alternately high and low positions with the result that the levers 14 and 15 and 8 will impart reciprocating` motion or movements to the pump rods 10, and by co-ordinating the adjustment of pressure in the springs 22 and 23, and the lengths of the connecting rods 13 and 25, to the buffer springs 28 and the load on the pump rods 10, the kinetic value of the oscillating pendulums is transferred into the reciprocating motion of the pump rods 10 with a hitherto unknown efficiency.

The pendulums 5 are graduated so as to locate weights G suitably, and the levers 14, 15 and pendulums 5 are angularly adjustable so as to give the correct juxtaposition for the load required. 1n the same manner, it will be understood how the auxiliary walking beam 29, connected to walking beam 3 by bolts 30, can cause the pendulums 35 to operate synchronically with pendulums 5 to alleviate and control the reactive work of the springs 22 and 23 and the bumpers 28.

1t is clear, that by disposing several kinetic pump jacks as herein described in oper- The levers 34e are connected toreiger/c ation on one common shaft 11, with cranks in different angular positions, the operation becomes double, triple, or quadruple acting.

Vhat 1 claim is 1. A power ack comprising a frame and pivot shaft therein, an oscillating walking beam mounted on said shaft and provided with pendulums, one at each end, pivotally connected thereto at equally distant points from said Ypivot shaft, bell crank levers late erally and adjustably connected to said pendulums, a Y-lever rigid with .said pivot shaft for operating said shaft, yieldable means connecting said Y-lever to said levers, and means for actuating said oscillating walking beam.

2. A power jack comprising a walking beam and means for oscillating the same, pendulums hung from the ends .of said beam, adjustable weights on said pendulums, yielding bumpers to control and rebound said pendulums at the limits of their oscillations, a working walking beam provided with actuating devices, angularly adjustable bell crank levers connected to said pendulums, and operative means connecting said working walking beam and said bell crank levers.

3. A. power jack comprising a walking beam and means for oscillating the same, pendulums pivotally hung from the ends '0f said beam, reciprocating actuating devices independent of said walking beam and levers and adjustable connecting rods operatively connected to said pendu'lums and to said actuating devices.

L1. A. power jack comprising a walking beam provided with oscillating Ypendulums, one at each end, reciprocating working mem bers independent of said walking beam, re silient connections operatively connecting said pendulums and said working members, and an auxiliary walking beam provided with angularly adjustable pendulums at each end arranged to operate synchronously with said first named walking beam for controlling the extent of the oscillations thereof.

5. A power jack comprising a walking beam and means for actuating the same, pendulums hung pivotally on the ends lof said beam, levers laterally and angularly connected to said pendulums, a working walking beam and reciprocating working members actuated thereby, and yieldable means operatively connecting said working walking beam and said levers.

6. A power jack comprising a walking beam and means for actuating the same, pendulums pivotally hung on the ends of said beam, levers and means for connecting said levers to said pendulums at diderent angles, a working walking beam and reciprocating working members actuated thereby,

a Y-lever rigid with said working walking beam, and yieldable and resilient means operatively connecting said levers and said Y- lever.

7. A power jack comprising a walking beam and means for actuating the same, pendulums pivotally hung on the ends of said beam, upper and lower projecting levers and means for rigidly connecting said levers to said pendulums at different angles, a rod adjustably connected to said lower projecting levers, said rod and said lower projecting levers serving to gauge the strokes of the upper projecting levers, a working walking beam and reciprocating working members actuated thereby, a Y-lever rigid with said working walking beam for operating the same, and yieldable and resilient means operatively connecting said Y-lever to said upper projecting levers.

8. A power jack comprising a walking beam provided with oscillating pendulums, one at each end, reciprocating working members independent of said walking beam, resilient connections operatively connecting said pendulums and said working members, a frame for said power jack, an auxiliary walking beam rigid with said walking beam, angularly adjustable pendulums fulcrumed on said frame, means for adjustably spacing the free ends of said last named pendulums from each other, and means for yieldingly and adjustably connecting said last named pendulums to the ends of said auxiliary walking beam.

In testimony whereof, I have set my hand 35 this 15th day of November, 1921.

` FRED. D. HOFFMAN. 

